HPW Series
Axial
1.25" /
31.75mm
min.
B
FeATuRes
• High precision
• All welded construction
• Molded thermosetting plastic
bobbin
• Wide ohmic range combined with
tight tolerance
• Excellent long-term stability
• Inherent low temperature coef-
ficient
• Extremely low Thermal EMF
• Low voltage coefficient
• Low noise
COnsTRuCTiOn
All Welded Construction:
The
combination of all welded con-
struction and compatible materials
provide the most reliable means of
interconnects possible.
Butt Weld of Tab to Terminal:
A tab material of 800 ohm alloy
(the same as the resistance wire)
is butt welded to the terminal and
molded deep into the resistor
bobbin. This design parameter
assures the least possible DC
transients due to thermal EMF.
Bobbin Design:
The ratio of the
height of the Pi wall to the width
of the Pi and to the diameter of
the bobbin mandrel are critical to
the basic stability of a wirewound
resistor. These parameters are
optimized for each wire size, watt-
age size and range of resistor
values.
Encapsulation Material:
Both the
bobbin and the final encapsulation
material are thermosetting alkyd
polyester. The resulting resistor
is virtually a homogeneous mass
with an identical coefficient of
expansion which is unaffected by
the most violent of temperature
cycling. All types are unaffected by
application of solvents.
Terminal Materials:
The standard
terminal material is hot solder
dipped copper (C5N). Other avail-
able materials are bare nickel
(N1N) and gold plated nickel
(N2N).
High Precision Welded Axial and Radial
A
Round Radial
C
A
Model
101P
102P
203PC
203PA
305PA
505PA
Flat Radial
A
C
B
Dim. C
Dim. D
sPeCiFiCATiOns
B
D
0.150 /
3.81
0.110 /
2.79
0.125 /
3.18
0.125 /
3.18
0.150
0.200
0.200
0.300
/
/
/
/
3.81
5.08
5.08
7.62
—
—
—
—
Power Rating
Max. @125°C Max.
Type
Ohms (Watts) Volts
123A
111k
0.05
150
118A
192k
0.05
150
122A
199k
0.05
150
102A
334k
0.10
150
102AL
334k
0.10
150
101A
410k
0.10
300
153A
435k
0.10
103A
633k
0.10
150
135A
750k
0.10
105A
820k
0.125
184A
820k
0.125
300
185A*
961k
0.125
300
202A
968k
0.25
200
204A
1.42 M
0.25
203A
1.7 M
0.25
200
205A* 1.93 M
0.33
400
207A* 3.0 M
0.50
800
308A
3.0 M
0.60
800
210A* 4.10 M
0.50
800
307A
5.63 M
0.60
310A
7.68 M
1.00
800
505A
10 M
1.00
510A* 24 M
1.25
800
515A* 35 M
1.50
1200
517A
43 M
1.75
1200
520A* 43 M
2.00
1200
101P
453k
0.125
150
102P
821k
0.125
150
203PC 1.59 M
0.25
150
203PA 1.48 M
0.25
150
305PA 3.3 M
0.50
505PA 9.5 M
1.00
*Available in hermetically sealed
Overall Dimensions
(±.020 in./ ±.508
mm)
A
B
0.100 /
2.54
0.230 /
5.84
0.130 /
3.30
0.180 /
4.57
0.123 /
3.12
0.218 /
5.54
0.110 /
2.79
0.250 /
6.35
0.130 /
3.30
0.313 /
7.95
0.130 /
3.30
0.375 /
9.53
0.150 /
3.81
0.245 /
6.22
0.150 /
3.81
0.300 /
7.62
0.160 /
4.06
0.500 /
12.70
0.150 /
3.81
0.310 /
7.87
0.187 /
4.75
0.375 /
9.53
0.187 /
4.75
0.500 /
12.70
0.250 /
6.35
0.310 /
7.87
0.250 /
6.35
0.375 /
9.53
0.250 /
6.35
0.343 /
8.71
0.250 /
6.35
0.500 /
12.70
0.250 /
6.35
0.750 /
19.05
0.312 /
7.93
0.810 /
20.57
0.250 /
6.35
1.00 /
25.40
0.375 /
9.53
0.750 /
19.05
0.375 /
9.53
1.00 /
25.40
0.500 /
12.70
0.500 /
12.70
0.500 /
12.70
1.00 /
25.40
0.500 /
12.70
1.50 /
38.10
0.500 /
12.70
1.75 /
44.45
0.500 /
12.70
2.00 /
50.8
0.300 /
7.62
0.320 /
8.13
0.250 /
6.35
0.250 /
6.35
0.250 /
7.92
0.312 /
7.93
0.270 /
6.86
0.320 /
8.13
0.375 /
9.53
0.500 /
12.70
0.500 /
12.70
0.500 /
12.70
AWG
24*
26
24
24
24
22*
22
22
22
22
22
22
22
20
20
20*
20*
20
20
20
20
20
20
20
20
20
22
22*
22
22
20
20
Minimum Values:
0.1Ω for ±1%
and ±0.5%; 10Ω for ±0.1% and
tighter
Resistance Tolerance:
±0.005%,
±0.01%, ± 0.02%, ±0.05%,
±0.1%, ±0.5%, and ±1%,
depending on style and value
Temperature Coefficient (TCR):
±10ppm/°C standard for 10Ω
and above. Higher
TC’s on low ohmic
values. TC match to
±1ppm/°C. High TC’s
upto +6000ppm/°C are
Lead Diam.
available
0.020 /
0.508
Standard temperature
0.016 /
0.406
range:
–10°C to +80°C
0.020 /
0.508
Working tempera-
0.020 /
0.508
ture range:
–60°C to
0.020 /
0.508
+145°C
0.026 /
0.660
0.026 /
0.660
0.026 /
0.660
0.026 /
0.660
0.026 /
0.660
0.026 /
0.660
0.026 /
0.660
0.026 /
0.660
o r d e r i n g i n f o r m at i o n
0.032 /
0.813
0.032 /
0.813
0.032 /
0.813
Format*
Tolerance
Type
Resistance
0.032 /
0.813
T = 0.01%
A, AL = axial
1R000 =
1
Ω
0.032 /
0.813
Q = 0.02%
P = flat radial
10R00 = 10
Ω
A = 0.05%
PA, PC = round 100R0 = 100
Ω
0.032 /
0.813
B = 0.1%
radial 1K000 = 1000
Ω
C = 0.25%
0.032 /
0.813
10K00 = 10 KΩ
*Not every format
D = 0.5%
100K0 = 100 KΩ F = 1.0%
is available in
0.032 /
0.813
1M700 = 1.7 MΩ
every wattage
0.032 /
0.813
Check product availability at
www.ohmite.com
0.032 /
0.813
0.032 /
0.813
0.032 /
0.813
0.032 /
0.813
0.026 /
0.660
0.026 /
0.660
0.026 /
0.660
0.026 /
0.660
0.032 /
0.813
0.032 /
0.813
203A1M700T
46
Ohmite Mfg. Co.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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